Solve 0.008=0.2^x

$$0.008= { 0.2 }^{ x }$$

Solve for x

$$x=3$$

Steps Using Definition of Logarithm

Swap sides so that all variable terms are on the left hand side.

$$0.2^{x}=0.008$$

Take the logarithm of both sides of the equation.

$$\log(0.2^{x})=\log(0.008)$$

The logarithm of a number raised to a power is the power times the logarithm of the number.

$$x\log(0.2)=\log(0.008)$$

Divide both sides by \log(0.2).

$$x=\frac{\log(0.008)}{\log(0.2)}$$

By the change-of-base formula \frac{\log(a)}{\log(b)}=\log_{b}\left(a\right).

$$x=\log_{0.2}\left(0.008\right)$$

Solve for x (complex solution)

$$x=-\frac{i\times 2\pi n_{1}}{\ln(5)}+3$$

$$n_{1}\in \mathrm{Z}$$